Electron discharge apparatus



1947. F. D. GOODCYZHILD ET AL 2,431,638

ELECTRON DISCHARGE APPARATUS Filed Dec. 2, 1943' Patented Nov. 25, 1947ELECTRON DISCHARGE APPARATUS Frank Douglas Goodchild and ChristopherHenry Foulkes, London, England, assignors to Standard Telephones andCables Limited, London, England, a British company Application December2, 1943, Serial No. 512,578 In Great Britain August 18, 1942 Section 1,Public Law 690, August 8, 1946 Patent expires August 18, 1962 4 Claims.

This invention relates to electron discharge apparatus incorporatinghigh frequency resonators of the coaxial conductor type and is animprovement in or modification of the invention disclosed in patentapplication No. 399,599 and in British Patent No. 537,490 referred totherein.

In that application, means is shown for extending the coaxial conductorsforming the resonator outside the envelope of the tube, so that theelectrical length of the conductors may be varied by means operatingupon the part of the conductors outside the envelope.

According to the present invention, the outer coaxial tube of theresonator chamber is connected to a metal end cap which is sealed to theenvelope of the tube, and adapted for direct connection to the externalcircuit, and the inner portion of the resonator is connected to aconductor insulatingly sealed into the end of the metal cap, whereby thetube may be readily connected into an external coaxial transmissionline.

The accompanying partly sectional diagrammatic drawing illustrates oneembodiment of the invention. It illustrates high frequency electrondischarge apparatus incorporating a high frequency resonator of thecoaxial conductor type, the detailed structure of which is illustratedin an application of C. H. Foulkes, one of the inventors herein, filedNovember 20, 1943, Serial No. 511,099. The outer coaxial tube of theresonator chamber is indicated at A and the drift tube at B. The metalend cap C is sealed to the glass envelope D and carries the centralconductor E within a glass seal F. This central conductor i connected bya flexible lead G with the drift tube B. The resonator tube A is a pushfit within the metal cap C so that the two are electrically connectedand the external output circuit comprising a coaxial transmission linehaving an outer member J and an inner member K, may be connected directto the cap C and central conductor E. Tuning of the resonator may alsothus be effected externally of the tube. The metal cap C is preferablyprovided as shown with a metal flange H soldered thereto whereby thetube may be readily connected to an external coaxial transmission line Jby bolts passing through holes I in the flange. The central conductor Emay be screw-threaded at the end for ready connection to the centralconductor K of the transmission line.

What we claim is:

1. High frequency electrical discharge apparatus of the coaxialresonator type comprising inner and outer coaxially disposed resonatormembers, an envelope enclosing said resonator members, a metal end capconnected to said outer resonator member and sealed to said envelopethereof, an elongated member connected to said inner resonator member,coaxially disposed therewith, and insulatin-gly sealed to said metal endcap, said cap and said elongated member being adapted to couple directlyto an external coaxial transmission line.

2. Apparatus as set forth in claim 3 in which the outer coaxialconductor forms a portion of the envelope wall.

3. High frequency electrical discharge apparatus of the coaxialresonator type comprising inner and outer coaxial resonator members,inner and outer coaxial conductors electrically connected to saidmembers, said outer coaxial conductor being provided with a wall portionfitting against an end portion of the outer tubular coaxial resonatormember, an envelope enclosing said members, including an insulatingport-ion connecting said conductors, the conductors having coaxialportions exposed at the outer side of said envelope for directconnection to an end of a coaxial line.

4. Apparatus as set forth in claim 1, in which said cap includes acoaxial flange terminal to which said outer coaxial transmission linemay be readily engaged.

FRANK DOUGLAS GOODC'HILD. CHRISTOPHER HENRY FOULKES.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 2.287.845 Varian et al June 30,1942 2,170,219 Seller Aug, 22, 1939 2,246,125 Crawford June 1'7, 19411,716,931 Prindle June 11, 1929 2,280,980 Samuel April 28, 19422,298,950 Litton Oct. 13, 1942 2,091,443 Heintz Aug. 31, 193"! 1,800,104Hansell Mar. 22, 1932

